Coating fluid for forming hard coating and substrates covered with hard coating

Abstract

A coating liquid for forming on a substrate surface a hard coat film which exhibits a high refractive index, being excellent in resistance to hot water, weather resistance, scuffing resistance, attrition resistance and dye affinity, and which does not exhibit photochromism, is provided. A coating liquid for forming a hard coat film, comprises a matrix-forming component and composite metal oxide particles of 1 to 100 nm average particle size, composed either of an iron oxide component and a titanium oxide component used at a specified ratio or an iron oxide component, a titanium oxide component and a silica component used at a specified ratio. A substrate coated with a hard coat film is formed by applying the above coating liquid to the substrate surface and effecting drying.

1. A coating liquid for forming a hard coat film, comprising a matrix-forming component and particles of a composite metal oxide,
 wherein the composite metal oxide particles are composed of an iron oxide component and a titanium oxide component, the weight ratio Fe 2 O 3 /TiO 2  being in the range of 0.0005 to less than 0.005, provided that Fe 2 O 3  and TiO 2  represent the weight in terms of Fe 2 O 3  of the iron oxide component and the weight in terms of TiO 2  of the titanium oxide component, respectively,  
 wherein the composite metal oxide particles have an average particle size ranging from 1 to 100 nm, and said film exhibits no perceived photochromism or coloration from weathering.  
 
     
     
       2. The coating liquid for forming a hard coat film as claimed in  claim 1 , wherein the composite metal oxide particles have their surface modified with an organosilicon compound. 
     
     
       3. The coating liquid of  claim 1 , wherein the weight ratio Fe 2 O 3 /TiO 2  is in the range of 0.001 to 0.0045. 
     
     
       4. A substrate coated with a hard coat film, which is formed by applying to the substrate surface the coating liquid for forming a hard coat film as claimed in  claim 2 . 
     
     
       5. The substrate coated with a hard coat film as claimed in  claim 4 , wherein the hard coat film has its surface overcoated with an antireflection film. 
     
     
       6. A substrate coated with a hard coat film, which is formed by applying to the substrate surface the coating liquid for forming a hard coat film as claimed in  claim 1 . 
     
     
       7. The substrate coated with a hard coat film as claimed in  claim 6 , wherein the hard coat film has its surface overcoated with an antireflection film. 
     
     
       8. A coating liquid for forming a hard coat film, comprising a matrix-forming component and particles of a composite metal oxide,
 wherein the composite metal oxide particles are composed of iron oxide, titanium oxide and silica, the weight ratio Fe 2 O 3 /TiO 2  being in the range of 0.0005 to less than 0.005, and the weight ratio SiO 2 /(Fe 2 O 3 +TiO 2 ) being in the range of 0.001 to 1.0, provided that Fe 2 O 3 , TiO 2  and SiO 2  represent the weight in terms of Fe 2 O 3  of iron oxide, the weight n terms of TiO 2  of titanium oxide and the weight in terms of SiO 2  of silica, respectively,  
 wherein the composite metal oxide particles have an average particle size ranging from 1 to 100 nm, and said film exhibits no perceived photochromism or coloration from weathering.  
 
     
     
       9. The coating liquid of  claim 8 , wherein the weight ratio Fe 2 O 3 /TiO 2  is in the range of 0.001 to 0.0045. 
     
     
       10. The coating liquid for forming a hard coat film as claimed in  claim 8 , wherein the composite metal oxide particles have their surface modified with an organosilicon compound. 
     
     
       11. A substrate coated with a hard coat film, which is formed by applying to the substrate surface the coating liquid for forming a hard coat film as claimed in  claim 10 . 
     
     
       12. The substrate coated with a hard coat film as claimed in  claim 11 , wherein the hard coat film has its surface overcoated with an antireflection film. 
     
     
       13. A substrate coated with a hard coat film, which is formed by applying to the substrate surface the coating liquid for forming a hard coat film as claimed in  claim 8 . 
     
     
       14. The substrate coated with a hard coat film as claimed in  claim 13 , wherein the hard coat film has its surface overcoated with an antireflection film.